Engine Masters

Holley recently debuted the second iteration of its throttle body EFI system, and we're here to see if it's any better than the first version and any better than the carburetor we so dearly love. We'll walk you through the installation, the setup and the benefits. Most important, we'll show you the results.

Does a 300 shot of nitrous sound like a lot, or like you're just getting started? That's one way to tell if you should be running a plate or a port system, and the guys walk you through each system, how much power you can add through each, and the jetting differences between them.

As this show often does, we're diving back into the intricacies of camshaft grinds. This time, we're exploring not just split-duration cams, but how larger and larger splits affect the power curve. Will it make any difference at all?

We all know there's invisible voodoo that can make or rob power in an exhaust system. The guys explore the merits of stepped headers, whose primaries step up in diameter, and merge collectors, which create an intentional restriction in the collector, against good old-fashioned, no-frills headers. Do the frequency-tuning claims of the steps and the velocity-enhancing merges make a difference to your motor? Absolutely!